Note these code only work for the ds action replay v1.52 it will say on the top screen in the top right corner. This is the code for the manaphy egg press L+R to activate go to pokemart and talk to the green guy he gives it to you. Here is the code.
with this code you can steel pokemon from trainers. ps. if you catch a pokemon from a trainer the battle will be over once you catch it.
code ---> 9223b5fa 00002101
if the codes dident work look on how you entered it maby you will find something.this code you dont have to press any buttons. hope this helped